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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	$ 26.3	$ 63.6
Gross Unrealized Losses	(77.9)	(33.8)
Fair Market Value	5,230.7	5,231.0
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	5,282.3	5,201.2
Total short-term investments — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	(0.1)
Fair Market Value	105.6	89.9
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	105.6	90.0
Total fixed income securities — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	26.3	63.6
Gross Unrealized Losses	(77.9)	(33.9)
Fair Market Value	5,336.3	5,320.9
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	5,387.9	5,291.2
U.S. government
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	6.8	4.5
Gross Unrealized Losses	(16.1)	(11.6)
Fair Market Value	1,404.2	1,159.4
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	1,413.5	1,166.5
U.S. agency
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	0.1	0.5
Gross Unrealized Losses	(0.4)	(0.2)
Fair Market Value	47.4	52.1
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	47.7	51.8
Municipal
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	1.3	2.1
Gross Unrealized Losses	(0.8)	(0.2)
Fair Market Value	47.2	54.9
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	46.7	53.0
Corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	7.8	36.1
Gross Unrealized Losses	(40.5)	(11.8)
Fair Market Value	2,206.2	2,415.7
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	2,238.9	2,391.4
Non-U.S. government-backed corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses	(0.2)	(0.5)
Fair Market Value	93.2	91.3
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	93.2	91.5
Non-U.S government
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	3.6	6.4
Gross Unrealized Losses	(0.8)	(1.2)
Fair Market Value	402.6	484.9
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	399.8	479.7
Asset-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Fair Market Value	17.3	26.2
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	17.4	26.3
Agency mortgage-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	6.5	13.7
Gross Unrealized Losses	(19.0)	(8.2)
Fair Market Value	1,012.6	946.5
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	$ 1,025.1	$ 941.0

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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